1 //===------------------------- cxa_handlers.cpp ---------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //
9 // This file implements the functionality associated with the terminate_handler,
10 //   unexpected_handler, and new_handler.
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef _CXA_HANDLERS_H
14 #define _CXA_HANDLERS_H
15 
16 #include <exception>
17 
18 namespace std
19 {
20 
21 __attribute__((visibility("hidden"), noreturn))
22 void
23 __unexpected(unexpected_handler func);
24 
25 __attribute__((visibility("hidden"), noreturn))
26 void
27 __terminate(terminate_handler func) _NOEXCEPT;
28 
29 }  // std
30 
31 extern "C"
32 {
33 
34 extern void (*__cxa_terminate_handler)();
35 extern void (*__cxa_unexpected_handler)();
36 extern void (*__cxa_new_handler)();
37 
38 /*
39 
40     At some point in the future these three symbols will become
41     C++11 atomic variables:
42 
43     extern std::atomic<std::terminate_handler>  __cxa_terminate_handler;
44     extern std::atomic<std::unexpected_handler> __cxa_unexpected_handler;
45     extern std::atomic<std::new_handler>        __cxa_new_handler;
46 
47     This change will not impact their ABI.  But it will allow for a
48     portable performance optimization.
49 
50 */
51 
52 } // extern "C"
53 
54 #endif  // _CXA_HANDLERS_H
55